Question

pls solve the above questionif for an AP d=5,then t18-t13=____________
a)5 b)20 c)25 d)30
please include the steps ​

Answer 1

Answer:

Option(c)

Step-by-step explanation:

Note: nth term of the AP : tn = a + (n - 1) * d.

Given, common difference,d = 5.

Now,

⇒ t₁₈ - t₁₃

⇒ [a + (18 - 1) * d] - [a + (13 - 1) * d]

⇒ [a + 17d] - [a + 12d]

⇒ [a + 17(5)] - [a + 12(5)]

⇒ a + 85 - a - 60

⇒ 25.

Therefore, t₁₈ - t₁₃ = 25.

Hope it helps!

Answer 2

a= ?

t 18- t 13

a+ 17 d - a - 12 d

5 d

5*5= 25